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Composing Switches [message #479291]

Mon, 10 August 2009 15:08

Adrian Price

Messages: 61
Registered: July 2009

Member

Good day EMF NG,

A quick suggestion: wouldn't it be useful for the EMF-generated switch
classes to be more readily composable? Something like:

public interface org.eclipse.emf.ecore.util.Switch<T> {
EPackage getEPackage();
<T> doSwitch(EObject theEObject);
}

public class XxxSwitch<T> implements Switch<T> {
// Note: XxxSwitchImpl.getEPackage() { return XxxPackage.eINSTANCE; }
...
}

public class YyySwitch<T> implements Switch<T> {
// Note: YyySwitchImpl.getEPackage() { return YyyPackage.eINSTANCE; }
...
}

/**
* Example implementation; others possible.
*/
public class ComposedSwitch<T> implements Switch<T> {
private final Map<EPackage, Switch<T>> delegates = new HashMap<EPackage,
Switch<T>>();

public ComposedSwitch<T>(Switch<T>... delegates) {
for (Switch<T> delegate : delegates)
this.delegates.put(delegate.getEPackage(), delegate);
}

public T doSwitch(EObject theEObject) {
return
delegates.get(theEObject.eClass().getEPackage()).doSwitch(th eEObject);
}
}

Thanks,

Adrian Price
Senior Architect | TIBCO Software, Inc.

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[Message index]

		Composing Switches By: Adrian Price on Mon, 10 August 2009 15:08
		Re: Composing Switches By: Ed Merks on Mon, 10 August 2009 15:51
		Re: Composing Switches By: Adrian Price on Mon, 10 August 2009 16:45
		Re: Composing Switches By: Adrian Price on Wed, 12 August 2009 21:30
		Re: Composing Switches By: Ed Merks on Thu, 13 August 2009 07:58
		Re: Composing Switches By: Adrian Price on Thu, 13 August 2009 11:00
		Re: Composing Switches By: Ed Merks on Thu, 13 August 2009 12:47
		Re: Composing Switches By: Adrian Price on Thu, 20 August 2009 22:53

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